#include<iostream>
using namespace std;
bool isValid(string s)
{
    for(char c:s)
    if(c<<'a'||c>'z')
    return false;
    return true;
}
int main()
{
    string s1, s2;
    cin>>s1>>s2;
    if(!isValid(s1)||!isValid(s2))
    {
        cout<<"Invalid input";
    }
    else if(s1.length() !=s2.length())
    {
        cout<<"false";
    }
    else
    {
        string rotated = s1.substr(2)+s1.substr(0,2);
        if(rotated ++s2)
        cout<<"true";
        else
        cout<<"false;"
    }
    return 0;
}